1. An abnormal increase in the number of lymphocytes in the blood.
Usage: Medical/clinical term; Often indicates infection or immune system response

Examples

• The blood test revealed lymphocytosis, suggesting a viral infection.
• Lymphocytosis is commonly observed in patients recovering from mononucleosis.
• The doctor noted lymphocytosis in the complete blood count and ordered further testing.
• Chronic lymphocytosis can be a sign of leukemia or other serious conditions.
• Mild lymphocytosis may resolve on its own once the infection clears.